Re: 39 Packard OD solenoid

Posted by HH56 On 2022/3/24 12:01:48

You are cruising at 30 and the flyweights have mechanically done their job and prepared the pawl for the automatic engagement. Nothing has yet put the car in OD. The solenoid is just sitting there waiting for something to do because on the R6 it has nothing to do with engagement.

Letting your foot off momentarily when cruising at 30 slows the engine but since the wheels are still going at the same speed a mechanism in the OD that has been blocking the pawl from fully entering the sun gear before this point does a quick movement due to the sudden change or difference in speeds. This action clears the path for the pawl to fully engage which it does via a spring to finally put the car in OD. Solenoid is still just sitting there.

If you want to pass a car or have another reason to drop out of OD, you tromp the accelerator, the kickdown switch is activated and NOW the solenoid has something to do which is to pull the pawl out of the sungear that the flyweights and spring had put in so OD can drop out.

After you pass the car and let up on the accelerator to de-engergize the kickdown sw the solenoid drops out and just sits there with the pawl free to move back into the sun gear when conditions are met. The mechanism has it blocked again but letting your foot off the gas does the speed change and pawl is unblocked so spring moves it back in the sun gear and puts the car back in OD. Solenoid waits and does nothing until you want to drop out of OD again.